i have'nt driven a savvy, but saw one called bullet-proof break down. i've seen several t-maxxes break relatively easily. i've owned warheads, lets not even go there. i currently own big block revos. i'm not going to say they don't break. the big block motors can create problems that probably would'nt occur otherwise. what i'm trying to say is, that a stock revo 3.3 is a pretty darn tough piece of machinery.